Part:BBa_K2632002

Promoter sifA

Gene sifA locates in Salmonella pathogenicity island-2 (SPI-2) and has the function of maintaining the integrity of Salmonella-Containing Vacuole (SCV). Some studies reported that the expression of SifA requires an intracellular enviroment. In other words, sifA promoter expresses SifA only when salmonella enters the host cells¹. A fragment including sifA promoter region and RBS region was obtained by PCR from the Salmonella SL1344 genome. SipD is required for bacterial internalization. ΔsipD mutant cannot enter host cells. Thus, we use this strain as a control. Microscopy suggests that only intracellular bacteria express eGFP which is under the control of P_sifA (Figure 1).
Figure 1. Hela GSDMD KO (knockout) cells are infected with the ΔsipD or ΔsifA mutants, respectively. These mutants contain a low copy number plasmid to express eGFP which is regulated by P_sifA.

Notice

This part carries it's native RBS. You can attach a CDS to it.
This part should be in a low copy plasmid such as PSB4K5, or it will express before Salmonella's entry to host cells.

Use in Salmonella only.

Reference

1. Garmendia, J., Beuzon, C. R., Ruiz-Albert, J. & Holden, D. W. The roles of SsrA-SsrB and OmpR-EnvZ in the regulation of genes encoding the Salmonella typhimurium SPI-2 type III secretion system. Microbiology 149, 2385-2396, doi:10.1099/mic.0.26397-0 (2003).

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]